clk: Always vote INT_MAX as maximum voltage for a rail

Update regulator set voltage requests to always send INT_MAX as the max
voltage, this will ensure clocks never set any upper bound request for any
voltage regulator.

This avoids regulator_set_voltage() failures arising from different
regulator consumers specifying different max voltages.

Change-Id: Ie803d45623dbc4b9b2c31502e240c311db261f66
Signed-off-by: Taniya Das <tdas@codeaurora.org>